Improvement in hoistingkmachines



FIG.5

vFlam may To all whom 'it lmay concern g waited gime @wiwi @iiiw Josnrin Jaws-Boar, .or Bacon rianne, ENGLAND, AssIeNon To HENRY A.V CLARKE,- 0F BOSTON, MA SSAGHUSETTS.

Laim-Patent 1ro. 100,700, dated March 15,1870.

The Schedule referred to in these Letters Patent and making part of 'the carne4 v y Be it known'that I, JosnPH JnwsBUnnla-te of Kinver, now of Brook Fields, near Birmingham, England`,havevinvented certain new and useful Improvements inMzichines for Raising Weights, which im provements may alsolbe appliedto otherinachinery g and I do hereby declare that the following is a full and exact, description thereof', reference beingy had to the accompanying drawings "forming part of this spec'- ification.v l

Myinventionconsistsin constructing machines for v raising weights and for other 'purposes with the rnechanical arrangements hereinafter described, by which the motion communicated to a shaft or axis is' reduced `in speed and proportionately increased in force in a simpler manner than by the mechanical arrangements ordinan'ly employed for that purpose.

:centricA I constructa crab for raising weights as follows: i 0n an axis turned hya winch `or otherwise an ecxed, the said eccentric carrying a pinion which is loose on the eccentric and square shoulders,

or pins on the said pinion `engage in slots lin van oscillating plate or arms; the pinion hence has no vrotary motion; The said pinion is gear/ed into anvinterior toothed wheel havingl one or more teethv more than `the pinion.

` On eachrotation' of theaxis carrying the pinion the, same is carried `round `the inside toothed wheel, and causes thesaid toothed wheel to advance to the e'xtent of one or more teeth.

In order still further-'to increase the power of the machine, the arrangement ,described may be repeated,

that is, the inside toothed wheel may carry an axis, on the end of which is a second pinion, incapable, like I the first, of rotary motion. `The second pinion engages with a second inside toothed wheel, which carriesa hollow axis working on the axisfof `the first inside toothed wheel.. The said second toothed wheel advances to the extent of one or more teeth during one rotation of the first' toothed wheel.

The chain or. rope' by which the weight is. to be liftedmay be wound on the hollow' axis ofthe second toothed whe-el, or the said axis may carry a pinion en- `gagingwith a rack.

The application of my invention to pulleysfor raising weights resembles in all essential respects its ap` plication to crabs already described.`

In applying my invention toa lathe, I'make an ec- .centric on the end of that part of the shaft carrying ,'thedriving-pnlleys, vthe said eccentric carrying a pinion-incapableof rotation; `The saidpinion engagesiin an inside toothed wheel on the endof the shaft of the Tiiemotionof the pulley-shaft carries the pinion round the inside toothed wheel, and causes it and the lathe-shaft to advance through the distance of 'one or more teeth on each rotation of the pulley-shaft.

The lathe-shaft and pulley-shaft may be coupled together and made to rotate at the same speed by throwing ont .of gear the oscillating plate .or arms which engage withthe shoulders or pins of the pinion, and

- connectingthe two shafts together by a pinor othelwise.

Having now explained the nature ofV my invention,

I will proceed to describe, with refererence to the accompanying drawings, the manner in which the same is to be performed.

Figure 1 represents in elevation, partly in section, a simple form of crab constructed according to my invention. t

Figure 2 represents an elevation oi' a portion ofthe same. y Like letters indicate the same parts in these figures.

An axis,'a, carries an eccentric, b, upon which eccentric b is fitted a pinion, c. l

This pinion c is loose upon the eccentric, and two pins,'d, onthe pinion c, engage in slots in the plates or arms e.

The said' plates or armse oscillate upon centers f,- and are capable of rising and falling simultaneously f by the stem g, on which they are supported, passing through the bracket h attached to the frame of the crab.

The oscillating arms e, by engaging with the pins d, keep the pinion c from performing a rotary motion, but leave it free to'mo've in a vertical plane. It can hence be carried round on the eccentric b, the arms e oscillating on their centers f and the rod'g' rising and falling in the bracket h.-

'lhe pinion c engages with the inside toothed wheel i, which has one tooth more than the pinion c. On

each rotation of the axis a the pinion c is carried round .the toothed wheel t', and causes the said toothed wheel to advance to the extent of one tooth.

The inside toothed wheel i is fixed on the barrel or. drum k, and communicates its rotary motion thereto, i and the cha-in or rope by. which the weight -`isy to be i lifted is wound upon the lsaid barrel or drum. l

The rotary motion communicated to the axis, a by means of a winch at a? is thus communicated to the barrel or drum k, diminished in speed but increased in force.

The power of the crab may be still further increased lby means of the toothed wheel l on the shaft a, with which wheel the pinion m on the axis a may be made to gear. The winch in this case is applied` to the square end of` theV axis n, instead of at a2.

, The crab, ligsrl and 2, may also be-used as an ordinary crab by throwing" the. arms 'e out of gear with the pinsd and'coupling the barrel k to the shaft'a by the link p and cranked leverg.

means of the sliding clutch o. The'rotary motion of the shaft ais in this case communicated directly to the barrel or drum k. The manner in whichthe arms e may be thrownout of gear with the pins d will be understood by reference to fig. 7 and to the descripf tion of the same.

Figure 3 is a side elevation, and

Figure 4 a vertical longitudinal section of another crab constructed according to my invention, the said crab being constructed for the exertion of greater power than that represented in figs. 1 and 2.

Figure 5 is an elevation of one end of the said crab.

Figure 6 is an elevation of the same end as g. 5, but with the framing or end plate removed.

Figure 7 is au elevation of the working parts of the other end of the said crab, illustrating the manner in which the pinion is thrown into and ont of gear with the oscillating arms both of' this crab and that represented in figs. l and 2.

Like letters indicate the same parte in figs. 3, 4, 5, 6, and 7 The axis or shaft a, to which motion is communi' cated by the winch c2, carries an eccentric, b, on which is fitted a pinion, c, whose rotation is prevented by the pins d engaging ywith the oscillating arms e turning upon the centers f.

The rod g, carrying the arms e, is capable of rising and falling in the bracket It. A

i is the inside toothed wheel in which the pinion c engages. By turning the winch n? a slow rotary motion is communicated to the wheel i.

The said wheel is fixed at one end of the hollow shaft k, the other end of' which shaft carries a second eccentric, b2, and on the said eccentric is a pinion, c3.

This pinion c2 is provided with pins al, which engage with arms e", and prevent the rotation of the said pinion.

The pinion o2 engages in an inside-toothed wheel, i2,

which is fixed on the barrel or drum k2.

The motion of the winch a2 is transmitted to the drum or barrel k, through the eccentric b and pinion c, to the inside-toothed wheel t; from the wheel t', through the hollow shaft 7:, to the eccentric b2 and pinion c2,- and from the pinion c2 to the wheel i2 and barrel or drum k2.

. Each rotation of the winch u? causes the wheel t to advance one tooth, and each rotation of the toothed wheel fi, hollow shaft k, and eccentric b,- causes the wheel i? to advance one tooth.-

When it is desired that the crab shall not have so great a power as-that which it has when lthe parts are arranged as described, the arms c2 may be thrown out of gear with the pins d2 of the pinion c2 when the said pinion c2 is capable of rotation. By then connecting the barrel or drum k2 with the hollow shaft k by means of a pin or screw passed through the former into the latter, or by connecting them in any other way, the said drum k2 rotates with the hollow shaft k.

I will now describe, with reference to fig. 7, the manner in which the pinion c2, figs. 3, 4, 5, 6, and 7 and the pinion c, figs. 1 and 2, are connected witll and disconnected from the oscillating arms by which the rotation of the pinion is prevented.

The said arms are connected together by means of When the parts are in the position represented in fig. 7, the pinion cz heilig disengaged from the arms e2 is free to rotate, and the rotation of the eccentric b2 `communicates no 'motion to the wheel i2.

By lifting the handle r of the lever q vertically, the arms e, cross-piece f", and rod q2 may be raised until the slots in the said arms c2 are brought opposite to the pins cl2 of' the pinion c2. By then moving the handle fr in a nearly horizontal direction from the pinion c, so as to make the said handle tum upon its joint q2, the arms e2 are made to approach one another, and the pins al2 are made to engage in the slots in the arms e2. The rotation of the pinion c2 is thus prevented, and the rotation of the cam l)z communicates a slow motion to the drum or barrel k2.

The engagement of the arms e2 with the pins d may be maintained by means of a coiled spring between the two arms e2.

Figure 8 is a transverse section of a pulley for raising weights, constructed according to my invention.

Figure 9 vis a longitudinal vertical section of the pulley.

Figure 10 is a side elevation, and

Figure 11 a front elevation of the same.

Figure 12 is a portion of' the pulley, with a piece of cha-in passing over it.

Like lettersiudicate the same parts in figs. 8, 9, 10, 11, and 12.

The pulley c b is made in two parte, of the same diameter. Y

The part a turns on the axis c and the part b turns on the eccentric part d of the said axis.

The said axis c d is fixed in the frame e of the pui ley.

On the periphery of' each of the parts a b, and near the faces thereof, radial projections orstuds f are made.

. In the middle of each part and between the studs or projections f a groove, g, is made.

The chain used with the pulley is temporarily fixed on the parts a b by each alternate link of'v the. chain engaging between the studs or .projections j, and in the grooves in the said parts, as will be understood by referring to the separate view, fig. 12.

On the inner face ofthe part b of the pulley a pinion, h, is situated, and in the face of the part a a hollow toothed wheel, t', is made, the said hollow toothed wheel i being provided with one tooth more than the pinion h.

An endless chain passes over the parts a b in ,the following manner: commencing with the chain on the near side of' the part a, the said chain passes over the top of the part c, descends ou the distant side of the said part a, and, descending below the pulley, returns, forming a loop in which a single pulley is placedthe said single pulley being attached to the weight to be raised. The returning chain ascends ou the near side of the part b, and passing over the top of' the same descends on the distant side of the part b, and passing downward below the pulley returns to the near side of the part a, the point from which the course of the chain was first described.A

the pulley-loop, and the other loop the hand-loop. By pulling one or other side of the hand-loop thepulley a b is made to rotate.

The effect of the fixed eccentric d is to canse the pinion 71. to roll round within the inside-toothed wheel t', the teeth of the said pinion engaging during the rolling motion with the teeth of the wheel t', but as the wheel i has one tooth more than the pinion h, the said pinion h performs a complete rotation during the time that the inside-toothed wheel t' is performing a rotation less the' length of' one tooth; hence the part b of the pulley advances one tooth upon the part a during each rotation, and the chain passing over the part b is consequently heilig paid out or drawn in somewhat faster than that part of the chain which passes over the parta. The pulley-loop is thereby slowly lengthed or shortened, and the single pulley support-ed in it- Vslowly raised or allowed slowly to descend.

The action of' the parts of the pulley differs in no essential respect from the action of corresponding parts inthe crab already described. In the crab the first motion is given to the axis and eccentric, thcl pinion on the eccentric being kept from rotating. 1n the I will call the loop in which the single pulley works disengaged from the pins n lowing manner:

` pulley the first motion is given to the drnmor lpulley, the eccentric being fixed andthe pinion rotating upon it.

Figure 13 is 'a side elevation ot' a lathe-head constructed according to my invention, theholding-arms x `or levers being removed, and

Figure 14 is a section of the lathe-head, taken throught-he line a of'iig. 13.

Like letters indicate thc same parts in these fi ures. On the hollow shaft b carrying the speed-pnlly c, I place an eccentric, d, on which is fitted the pinion e. l The lsaid pinion e ismade `incapable of rotation by lthe engagement of the slotted arms or levers f g with `the pins'h, on the said pinion c. a

The stem i, to thetop of which the`y arms or levers 1 fg are jointed, rises or falls' in the bed k of the lathe. On the end of the lathe-spindle or shaftl is an inside-l toothed wheel, m, with which the pinion e engages, the said wheel having one more tooth than the pinion e. i

` By the motion of the pulleyshaft b the pinion is carried round the wheel fm, and the lathe-shaft l is made tojadvance through the distance of one tooth on each rotation of the said pulley-shaft b. A slow roi tary motion `is thereby communicated to the said lathe` shaft. a

The said armsor` levers turn `on centers fl g2, and

are pressed outward, when atvliberty to move, by the spring o between them.

The lever g is jointed to the end of thelcverp, and

the lever j' is jointed to thel lever p by means of the link g. .lhe lever p is onone side and the link q on `the other side of the arm or lever f.

k maree 3 When the leverp and link q are in the positions represented in iig. 14, a piu, c', is passed through them, and the said lever and link fastened together, and the levers f y thereby held in gear with the pinions h h.

By removing the pint` and depressing the lever p into the positionindicated in dotted lines, the levers f g can turn on their centers, and are pressed outward dicatedin dotted lines. The pinion e is then at lib erty to rotate with the pulley-shaft b. This arrangement of the holding-arms or levers may be applied to the crabs hereinbefore described. n Although I have only describedand illustrated my improvements in machines for raising weights in counection with crabs and pulleys, yet my said `invention may be applied to other machinery for raising weights. Having now described the nature of my invention and the manner in which the same is tobe performed, I wish it to be understood' that I do not limit myself to the precise detailsherein described and illustrated, as the same may be varied'without departing from the nature of my invention; but Y.

What I claim as my invention, and desire to secure by Letters Patent, is l n 1. The wheels fi and c and eccentric b, lcombined and operating together substantially as and for th purposes set forth.

2. Preventing the rotation of the wheel or pinion c, by means of the oscillating arms e or other suitable device, substantially 'as set forth. x l 3. The application to crabs and other hoisting or littling-machinery otI the said `wheels and eccentric, sub-f stantially as and for the `purposes set forth.

ELIHU BURRITT,

EDWARD CAPERX.

and disengaged from the pins h by the spring o, as in'' I 4, The application of the said wheels and eccentric f 

